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US 2019/0153252 A1Published application
Ink compositions
AssigneeHewlett-Packard Development Company, L.P.
InventorsLarrie DEARDUFF, Jayprakash C. BHATT, Milton Neill JACKSON
Life of this patent
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Abstract
The present disclosure is drawn to ink compositions including an aqueous liquid vehicle, from 2 wt % to 7 wt % self-dispersed pigment dispersed in the aqueous liquid vehicle, and from 0.1 wt % to 1 wt % monovalent salt. The self-dispersed pigment to monovalent salt weight ratio in the ink composition can be from 3:1 to 35:1.
Claims15
An ink composition, comprising:
- an aqueous liquid vehicle;
- from 2 wt % to 7 wt % self-dispersed pigment dispersed in the aqueous liquid vehicle;
- and
- from 0.1 wt % to 1 wt % monovalent salt,
- wherein the self-dispersed pigment to monovalent salt weight ratio in the ink composition is from 3:1 to 35:1.
2 more elements
A method of formulating an ink composition, comprising:
- dispersing a self-dispersed pigment in an aqueous liquid vehicle;
- and
- adding a monovalent salt to the aqueous liquid vehicle, wherein the monovalent salt brings the ink to from 30% to 95% of a molar concentration of a crash point of the self-dispersed pigment.
A method of determining a crash point of a self-dispersed pigment, comprising:
- formulating an ink composition which includes a self-dispersed pigment;
- adding known concentrations of a monovalent salt to the ink composition to formulate multiple test samples, the multiple test samples provided by i) incrementally adding known concentrations to the ink composition or ii) adding different known concentrations to multiple portions of the ink composition;
- measuring colloidal vibrational current of the multiple test samples containing the various known concentrations of the monovalent salt;
- and
- determining a peak or near peak colloidal vibrational current which is just prior to a drop in the colloidal vibrational current, wherein the crash point is between the peak or near peak colloidal vibrational current and a drop in colloidal vibrational current.
2 more elements
Dependencies are inferred from the claim text.